Shock absorber



G. F. BISCHOF SHOCK ABSORBER Dec. 29, 1931.

Filed April 25, 1929 7. mm 9 I z z. z o e a z 1 a I Z o 0 O 6 9 T M I...H M wwmw i f p 4 1Q Z "W .Z l I 2 o W x 6 a a mm n.r n u r w a fa w 5 v Patented Dec. :29, 1931 Y usage:

rarest asics GEORGE E. IBISCHOF, 015 FORT WORTH, TEXAS SHOCK ABSORBER Application filed April 25, 1929'. Serial No. 358,066.

- This invention relates to a shock absorber and has relation more particularly to a device of this kind adapted for use in connection with an aeroplane and which serves effectually'to retard bounding of the aeroplane in landing and which is also designed in a manner to compensate'for lack of weight in the landing gear to, bringthe parts of the device in normal or original position. I The invention also has for an object to provide a device of this kind constructed in a manner to eliminate weight yet acting effectively and whereby the device is designed to eliminate air resistance, quick access to parts for repair and which operates for the betterment and safety of passengers.

hereinafter be definitely claimed.

Another object of the invention is to provide a device of this kind'embodying means. whereby air and liquid are employed to function' therewith but each of said fluids being under control, the-air being controlled to give ease of first contact andthe fluid controlled to gradually increase the efi'ectiv'eness of both the air and liquid. 4

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved shock' absorber whereby certain important advantages are. attained and thedevice-rendered simpler, lessv expensive and otherwise inore convenient, and advantageous for use, as will be hereinafter more fully set fOI'thm g Y The novel features of my invention will In order, that my invention -may be the better understood, I will now proceed to describe the same with reference to the accompanyingdrawing, wherein r Figure 1 is. a view in elevation of a shock absorber constructed in accordance with an embodiment of my i'nevntion;

-Figure 2 is an enlarged view partly in section andpartly in elevation, the section beingtaken substantially on the line 2- 2 of Figurel; j r

Figure '3 is ,a sectional view taken substantially on the'line 3+3 of Figure 1.;

Figure 4,.is an enlarged fragmentary view partly in section and partly in elevation illustrating one of the valves herein disclosed for use in connection with the piston;

Figure 5 is an enlarged fragmentary sectional view illustrating in detail the air vents and valves associated with the air chamber.

As disclosed in the accompanying drawings, 1 denotes a cylinder of desired size having one end closed by the fixed head 2 and its opposite endportion closed by the removable head 3. The head 2 at its axial center is provided with an elongated tubular extension 4, (the outer end 5 of which being closed and the bore 6 thereof being continued through the head 2. I

The outer end portion of the extension 4 is provided with the spaced ears 7 or other desired means whereby said outer end portion of the extension 4 may be operatively connected with the fuselage or other desired structure of an aeroplane.

Extending axially of the cylinder 1 and slidably disposed through the heads 2 and 3 thereof is an elongated plunger 8 the same being of a length whereby the upper portion of said plunger 8 of the assembly at all times is positioned with the bore '6 of the extension 4. This plunger 8 is preferably a metal t'ube having its upper end 9 closed so that the portion of the bore 6 above said closed end 9 serves as an air hamber for a purpose to 30 be hereinafter more particularly referred to.

The opposite or lower d portion of the, plunger 8 is adapted to be operatively engaged with the running gear of an aeroplane, as for example the axle thereof. Fixed-t0 the plunger 8 at a desired point thereon and within 'the cylinder 1 is high compression piston 10 havingdispos d therethrough a plurality of circumferent'aally disposed openings, each of said, openi gs 11 having as-. sociated therewith a downwardly opening .check valve 12 normally maintained closed by an' expansible spring 14 encircling the stem 15 of the valve 12 andinte'rposed between an enlargement 16 carried by the stem and the cross member 17 operatively supported by the piston IQ and disposed across -the opening. 11 a Interposed between the piston 10 and the head 20f the cylinder is a rebound spring 100 18 of desired tension and herein disclose as thought to be obvious that a shock absorber encircling the plunger 8. Interposed constructed in accordance with 'my'invention tween the head 3 of the cylinder 1 and the is particularly well adapted for useb reason piston 10 and also encircling the plunger 8 of the convenience an facility wit which is a spring support 19 of desired tension. it may be assembled and operated, and it The opening 20 of the head 3through which will also be obvious that my invention is the plunger 8 is directed has its outer porsusceptible of some change and modification tion enlarged to receive the packing 21. Without departin from the principles and Threaded said enlarged portion ofspirit thereof an for this reason I do not the opening 20 is a packing nut 22 through wish to be understood as limiting myself to which'the plungerisalso directed. This nut the precise arrangement and formation of 22 is adapted to be adjusted to take up and the several parts herein shown in carrying tighten the packing 21 as desired. In comout my invention in practice except as heremunication with the upper portion of the inafter claimed.

i 24" normally closed b structed spring,

"*7 opening of bore 6 of the extension} at diametrically opfstrumentality of an expansible spring 2 d fthe piston 10 b cylinder 1 will c eck or retard bounding and relati y minu the cloeedend'9 of thephfifer I claim posed pointsvand also with the atmosphere A shock absorber of the character deare'the nipples 23, in one of which is arscribed, comprising a hydraulic chamber, an

- ranged an inwardly opening check valve 24 air chamber secured to one end of said hynormally maintained closed through the indraulic chamber and coaxial therewith, a

lunger slidably mounted in said air chamwhile the second nipple 23 has arrange her and extending through and outwardly of therein an. outwardly opening check valve the other end of said hydraulic chamber, a a spring 25'. By grooved piston secured to said plunger and varying the tension 0 the springs 25 and slidably engaging said hydraulic chamber, a 25' the action of the valves 21 and 24' can piston ring mounted in the grooved portion be regulatedas desired. 3 of said piston, an inlet and an outlet port Suitably. fixed to the cylinder 1 and subfor said air chamber, check valves for each stantially concealing the same is a false of said ports, saidports opening at one side housing or casing 26 stream line to the'wind. 1 into the atmosphere, said piston having a This housing or casing 26 is preferably made 1plurality of bleeder openings therethrough, of sheet metal and riveted, as at 27 in deleeder check valves in certain of said bleeder 'eired applied-position .with respect to the openings limiting the flow of liquid in one cylinder t -The purpose of this housing or direction a supporting .sprin in said hyca'sing is to make the flow of air easier when draulic ,dhaxhber and contact ng with one the aeroplane is in htjthan would be the side of said piston, a rebound spring, and an case with the cylin er 1 'free and unobouter casinggmsitioned about said hydraulic v 1 chamber, sai outer casing having a restrict- In a 'landingfthe first contact '01 ed forward edge whereby to reduce the fricthe landing gear, the resistance ofiered to tion of said casing upon forward movement theliquid 28 within the thereof.-

v and In testimony whereof I hereunto aflix my which action is furtherfacilitated by the signature. I c 18. ring 18 is'of a'tension to GEORGE F.5-BISCHOF. carry its portion 0 the lbad of the aeroplane and to-keep the pistonloenormally at its lower position when the aeroplane is at rest. It is-to be stated atthis tinie'that the sp 19 is oi a; tension to support the ii 12d .w t ofthose attachedtothe'p ungrar e upwar vmovement'of-the iston 10, the c linder 1 is facilita by the e valves 12 while the opposite, relative movements of 'thmlinder '1 and piston 10 am eflectivel re ed by the un- I 29 ch 'I anynmnber Plunger 8 moves upwardly. compreesion o the air within the bore flabove 8 the liquid28 through the piston o 10 give eaaeoffirstcontactw 0 mite association with the piston 10 serves to gradually increase-the effectiveness of the action oiboth the air and liquid.

From the foregoing description it is 

